The purpose of the present invention is to provide an optical module having a structure whereby the optical axis does not deviate during YAG laser welding. This optical module is provided with: a bathtub-shaped concave metal base (11) in which a notch at the same height as a wiring ceramic (19) is provided in a lateral wall, and an optical semiconductor package (12), a waveguide-type optical element (13) and an optical lens (14) are mounted in the inside surrounded by the lateral wall; a wiring ceramic (19) embedded in the notch; a bathtub-shaped concave lid (15) for covering the optical semiconductor package (12), the waveguide-type optical element (13), and the optical lens (14), the open end parts on at least two opposite sides of the bathtub shape being disposed in the same plane; and a metal ring (20) disposed as a gasket between the concave metal base (11) and the concave lid (15), one side of the metal ring (20) being fixed to the concave metal base (11) and the wiring ceramic (19), and the other side being fixed to the concave lid (15).